| 1 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Oct 2025 |
| 2 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 3 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Oct 2025 |
| 4 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 5 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 6 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 7 | Cet Energy Corporation | Spring, TX 77391 | Oil & Gas Operator | Nov 2003 |
| 8 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 9 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 10 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 11 | Chief Operating Company | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 12 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Oct 2025 |
| 13 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 14 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 15 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 16 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 17 | Coastland Operations, LLC | Dallas, TX 75287 | Oil & Gas Operator | Oct 2025 |
| 18 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 19 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 20 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 21 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 22 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 23 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 24 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 25 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 26 | Crest Petroleum, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 27 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |